I used this method in the past for many years and it was helpful in acheiving good bit through skin.
Remove the skin and flip over.
Start the scraping 360* around the edges where there is significant fat build up. Then move into the center. I found using a dull knife helped, the key is not to tear the skin, especially in the center. You should end up with skin that is almost see through. Take your time, it takes awhile to get the hang of it.
Save the fat to make schmaltz for your breakfast toast
